We prefabricated the two units, including the turbine and the solar panels, and installed them as one unit on the roof. The size of the units is 12 x 7 x 5 metres (LxWxH) with a total weight of 24 tonnes. An important point of attention is, that during this assignment the visitors of the musical ‘Soldaat van Oranje’ would not be hindered by the assembly work, which took about 5 weeks. We successfully completed the job at the end of week 45.